DVD Shrink will not do it, if it is over 4.7 gb you will have to get rid of dummy files. read about this in other threads.
basic things to look for are languages that you will not use and/or videos. Sometimes a game will have both PAL and NTSC videos in the game....take out what you know you won't use.
Check out http://www.balugabutt.com/ That site is based around files you can delete on different games to make them fit on a dvd-5 disc.